Man-Hours and Distribution: M. King Hubbert Man-Hours and Distribution which was derived from an earlier article, Man-Hours A Declining Quanity in Technocracy, Series A, No. 8, August 1936.
These works along with the Technocracy Study Course also authored by Hubbert formed much of the basis of energy accounting and later biophysical economics models. This also formed aspects of 'natural capital' a concept used in 'systems ecology' and 'industrial ecology'. Hubbert along with Frederick Soddy and Alfred Lotka among others, formed the original basis of the ideas of an energy based economy and the basis of most of the ideas connected later in 'thermoeconomics' in regard to energy accounting, a concept first expressed in the Technocracy Study Course.
These ideas were very different compared to the Keynes type models held by many traditional economists.
Now the very basis of economics may have to shift toward this type of model given that sustainability or sustainable reckoning of the resource base no longer seems possible in a traditional what is referred to as neo-classic Price System type of economic approach.